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Sol-gel preparation method of lithium zinc titanate as lithium ion battery cathode material

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve problems such as unfavorable mass production, limited development and application, complicated process, etc., and achieve high production efficiency and low equipment investment Less, shorter effect

Active Publication Date: 2014-04-09
天津顺捷通科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the patented titanium source requires hydrothermal preparation, the process is complicated and the conditions are harsh, which is not conducive to large-scale preparation, which limits the further development and application of this material

Method used

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  • Sol-gel preparation method of lithium zinc titanate as lithium ion battery cathode material
  • Sol-gel preparation method of lithium zinc titanate as lithium ion battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 8.180 grams of citric acid and dissolve it in distilled water, add 5.288 grams of ethylene glycol, mix well, weigh 6.054 grams of isopropyl titanate, 0.525 grams of lithium carbonate and 1.558 grams of zinc acetate and add them to the above solution. After vigorously stirring for 2 hours, the solution turned into a yellow transparent sol, and continued to stir at 80°C for 4 hours to form a gel. The gel was transferred to a muffle furnace, heated to 800°C, and calcined for 3 hours to obtain a lithium zinc titanate negative electrode material, which was marked as "sample A".

[0023] Weigh 0.8 g of sample A, mix it with acetylene black and PVDF at a mass ratio of 80:10:10, stir evenly, coat it on a copper foil, place it in a vacuum drying oven, and dry it under vacuum at 120°C for 24 Hours, after rolling and punching, the electrode sheet was obtained; with the metal lithium sheet as the counter electrode and 1M LiPF6 EC:DEC:EMC solution as the electrolyte, a simulat...

Embodiment 2

[0025] Weigh 12.270 grams of citric acid and dissolve it in distilled water, add 7.932 grams of ethylene glycol, mix well, weigh 9.081 grams of isopropyl titanate, 0.788 grams of lithium carbonate and 3.168 grams of zinc nitrate and add them to the above solution. After vigorously stirring for 2 hours, the solution turned into a yellow transparent sol, and continued to stir at 80°C for 4 hours to form a gel. The gel was transferred to a muffle furnace, the temperature was raised to 800° C., and calcined for 3 hours to obtain a lithium zinc titanate negative electrode material. This material is labeled "Sample B".

Embodiment 3

[0027] Weigh 12.270 grams of citric acid and dissolve it in distilled water, add 15.864 grams of ethylene glycol, mix well, weigh 9.081 grams of isopropyl titanate, 0.788 grams of lithium carbonate and 2.337 grams of zinc acetate and add them to the above solution. After vigorously stirring for 2 hours, the solution turned into a yellow transparent sol, and continued to stir at 80°C for 4 hours to form a gel. The gel was transferred to a muffle furnace, the temperature was raised to 800° C., and calcined for 3 hours to obtain a lithium zinc titanate negative electrode material.

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Abstract

The invention discloses a sol-gel preparation method of lithium zinc titanate as a lithium ion battery cathode material. The sol-gel preparation method comprises the following steps of step1, dissolving citric acid and ethylene glycol in deionized water; step 2, weighing a titanium source, a lithium source and a zinc source according to the mole ratio of 3:1:1 into the obtained solution in the step1; step 3, stirring the system in the step 2 for two hours at 60 DEG C to obtain transparent sol; step 4, sequentially stirring the obtained sol in the step 3 for four hours at 80 DEG C; and step 5, transferring the obtained sol in the step 4 into a muffle furnace, and raising the temperature to700-800 DEG C and calcining for 3-5 hours to obtain the final product. The sol-gel preparation method disclosed by the invention solves the problem that a reactant is not uniform to mix caused by material mixing by ball milling or direct roasting in a process of preparing lithium zinc titanate by adopting a solid-phase reaction method.

Description

Technical field: [0001] The invention relates to a lithium ion battery negative electrode material, and further relates to a sol-gel preparation method of the lithium ion battery negative electrode material lithium zinc titanate. Background technique: [0002] With the continuous development of today's electronic equipment, the research and application of lithium-ion batteries have been paid more and more attention. At present, carbon anode materials have been successfully applied in commercial lithium-ion batteries. The carbon negative electrode has the advantages of a lower discharge platform and a higher lithium insertion capacity than metal lithium. However, since the potential of the carbon electrode after lithium insertion is very close to that of metal lithium, it is less than 0.1V vs Li / Li + , when the battery is overcharged, metal lithium may precipitate on the surface of the carbon electrode to form lithium dendrites, which will cause a short circuit and pose a s...

Claims

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Application Information

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IPC IPC(8): H01M4/485C01G23/00
CPCY02E60/122H01M4/485H01M10/0525Y02E60/10
Inventor 唐致远郗富昌凌国维
Owner 天津顺捷通科技有限公司
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